Why Bob always loses chess

We have a colleague who loves to play chess. One day we recorded his participation in the tournament on videotape in order to analyze his body language. The record showed that Bob often rubbed his ear and touched his nose during the game, but did this only when he was unsure of the next move. When the opponent showed an intention to make a move, Bob, with all his appearance, immediately showed what he thought of the proposed move. Feeling that the opponent’s move was beneficial to him, he hit his confidence with the help of the “spire”. When the intended move upset him or instilled uncertainty in him, he covered his mouth with his hand, sipped his earlobe or scratched his neck. All his gestures were absolutely obvious and predictable. When we told other members of our chess club about Bob's behavior, he could not win a single game from us anymore. Naturally, we will not give this book to him.